Adam said his wife knew that he was struggling with his faith but not that he had lost it completely.
"It's a very tough situation to be in," he said. "I can't think of another career that is so dramatically affected by a change in one's opinions or thoughts."
"At first I feared if I lose my faith, I'm gonna become some terrible person," Adam said. "As I lost my faith ... I realized that really had no bearing on who I am and my character and my actions. I live no differently than I did when I was a fervent believer."
Adam and Jack were included in a report by philosopher Daniel Dennett, a professor at Tufts University and well-known atheist, and his co-researcher, Linda LaScola. They are continuing their research into non-believing clergy. ABC News contacted the two pastors through Dennett and LaScola, verified their identities and positions, and interviewed them separately.